I am fairly good friends with a guy, our kids play together and I go out at work with him often (runs his own business) and we socialise once in a while and keep in touch.
He and his partner (his children's mum) split 8 years ago. My friend seems over it, they get along fine and he doesn't speak much about her, life seems to have moved on.
I was not friends with him when they were together. A few months ago his ex partner added me on instagram, I find her extremely physically attractive. One night a few weeks ago she sent me a highly sexual message, making it pretty clear she is interested in me sexually. We have messaged a bit back and forth. I asked what her ex, my friend would think about this and she replied that it's none of his business and she won't be telling. We have been planning when to meet.
I really want to, and I know it's a purely sexual thing. That's all I want and the way she is presenting it, it seems to be all she wants. Nothing relationship wise will come of it, so I suppose there's no risk of anyone finding out.
I just feel like I'm doing something wrong but then I think well he has slept with others and had other girlfriends since they split. He is over her, it was 8 years ago.
If I do this is it okay? Or morally, even if he is over her, is it wrong?